Volume 8, Number 3—March 2002
Dispatch
Epidemiologic Features of Four Successive Annual Outbreaks of Bubonic Plague in Mahajanga, Madagascar
Table
Results of bacteriology testing for Yersinia pestis, Mahajanga, Madagascar, by year
1995 | 1996 | 1997 | 1998 | Total | |
---|---|---|---|---|---|
Total suspected cases | 558 | 399 | 539 | 206 | 1,702 |
Laboratory-confirmeda cases | 117 | 97 | 214 | 87 | 515 |
Bacteriology | |||||
Number tested | 342 | 330 | 501 | 195 | 1,368 |
Number confirmed | 55 | 41 | 149 | 52 | 297 |
Number presumptive | 21 | 8 | 2 | 7 | 38 |
Number positiveb | 76 | 49 | 151 | 59 | 335 |
Percent positive | 22.2 | 14.8 | 30.1 | 30.3 | 24.5 |
F1 antigen Elisa | |||||
Number tested | 433 | 335 | 413 | 189 | 1,370 |
Number positive | 38 | 25 | 131 | 35 | 229 |
Percent positive | 8.8 | 7.5 | 31.7 | 18.5 | 16.7 |
Anti-F1 antibodies Elisa | |||||
Number tested | 365 | 344 | 396 | 191 | 1,296 |
Number positive | 68 | 59 | 137 | 48 | 312 |
Percent positive | 18.6 | 17.2 | 34.6 | 25.1 | 24.1 |
aConfirmed + presumptive and/or enzyme-linked immunosorbent-assay (
bConfirmed + presumptive cases.